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63. - Page 1 of 15 <br />AQiik <br />Redwood <br />CitylCallifornia <br />wended 1967 <br />A&/ <br />DATE: November 19, 2018 <br />SUBJECT <br />STAFF REPORT <br />To the Honorable Mayor and City Council <br />From the City Manager <br />Professional Services Agreement with ADS Environmental Services for Sanitary Sewer Flow Monitoring <br />Services <br />RECOMMENDATION <br />By motion, approve, and authorize City Manager to execute the Professional Services Agreement with <br />ADS Environmental Services in the amount of $425,400.00 for sanitary sewer flow monitoring services <br />for a term ending on June 30, 2022. <br />STRATEGIC INITIATIVE <br />Public Safety <br />BACKGROUND <br />Wastewater flow in a sanitary sewer system comes from three major components: base wastewater <br />flow, groundwater infiltration, and rainfall derived inflow and infiltration (RDI/1). Staff uses flow <br />monitoring data to cost effectively quantify RDI/I in the City's wastewater collection system. Analyzing <br />flow monitoring data helps staff to determine areas of high RDI/I, to calibrate the sanitary sewer <br />hydraulic model in order to assess the current capacity of existing sanitary sewer lines, and to plan <br />future upgrades of the sanitary sewer system. The data also informs future Capital Improvement <br />Projects to reduce sewer treatment costs. <br />The proposed agreement would assess the depth, velocity and flow rates at the flow monitoring sites, <br />establish daily average flows and minimum and peak flows for each flow monitoring site, and develop <br />rainfall data. <br />11L_ <br />City of Redwood City 1017 Middlefield Road, Redwood City, CA. 94063 Tel: 650-780-7000 www.redwoodcitV.org <br />30 <br />